protected override void OnRender(DrawingContext drawingContext)
{
FoldingMargin margin = VisualParent as FoldingMargin;
Pen activePen = new Pen(margin.SelectedFoldingMarkerBrush, 1);
Pen inactivePen = new Pen(margin.FoldingMarkerBrush, 1);
activePen.StartLineCap = inactivePen.StartLineCap = PenLineCap.Square;
activePen.EndLineCap = inactivePen.EndLineCap = PenLineCap.Square;
Size pixelSize = PixelSnapHelpers.GetPixelSize(this);
Rect rect = new Rect(pixelSize.Width / 2,
pixelSize.Height / 2,
this.RenderSize.Width - pixelSize.Width,
this.RenderSize.Height - pixelSize.Height);
drawingContext.DrawRectangle(
IsMouseDirectlyOver ? margin.SelectedFoldingMarkerBackgroundBrush : margin.FoldingMarkerBackgroundBrush,
IsMouseDirectlyOver ? activePen : inactivePen, rect);
double middleX = rect.Left + rect.Width / 2;
double middleY = rect.Top + rect.Height / 2;
double space = PixelSnapHelpers.Round(rect.Width / 8, pixelSize.Width) + pixelSize.Width;
drawingContext.DrawLine(activePen,
new Point(rect.Left + space, middleY),
new Point(rect.Right - space, middleY));
if (!isExpanded)
{
drawingContext.DrawLine(activePen,
new Point(middleX, rect.Top + space),
new Point(middleX, rect.Bottom - space));
}
}
static void OnUpdateBrushes(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FoldingMargin m = null;
if (d is FoldingMargin)
{
m = (FoldingMargin)d;
}
else if (d is TextEditor)
{
m = ((TextEditor)d).TextArea.LeftMargins.FirstOrDefault(c => c is FoldingMargin) as FoldingMargin;
}
if (m == null)
{
return;
}
if (e.Property.Name == FoldingMarkerBrushProperty.Name)
{
m.foldingControlPen = MakeFrozenPen((Brush)e.NewValue);
}
if (e.Property.Name == SelectedFoldingMarkerBrushProperty.Name)
{
m.selectedFoldingControlPen = MakeFrozenPen((Brush)e.NewValue);
}
}
public FoldingManagerInstallation(TextArea textArea) : base(textArea.Document)
{
this.textArea = textArea;
margin = new FoldingMargin() { FoldingManager = this };
generator = new FoldingElementGenerator() { FoldingManager = this };
textArea.LeftMargins.Add(margin);
textArea.TextView.Services.AddService(typeof(FoldingManager), this);
// HACK: folding only works correctly when it has highest priority
textArea.TextView.ElementGenerators.Insert(0, generator);
textArea.Caret.PositionChanged += textArea_Caret_PositionChanged;
}
/*
* void DemoMode()
* {
* foldingGenerator = new FoldingElementGenerator() { FoldingManager = fm };
* foldingMargin = new FoldingMargin { FoldingManager = fm };
* foldingMarginBorder = new Border {
* Child = foldingMargin,
* Background = new LinearGradientBrush(Colors.White, Colors.Transparent, 0)
* };
* foldingMarginBorder.SizeChanged += UpdateTextViewClip;
* textEditor.TextArea.TextView.ElementGenerators.Add(foldingGenerator);
* textEditor.TextArea.LeftMargins.Add(foldingMarginBorder);
* }
*
* void UpdateTextViewClip(object sender, SizeChangedEventArgs e)
* {
* textEditor.TextArea.TextView.Clip = new RectangleGeometry(
* new Rect(-foldingMarginBorder.ActualWidth,
* 0,
* textEditor.TextArea.TextView.ActualWidth + foldingMarginBorder.ActualWidth,
* textEditor.TextArea.TextView.ActualHeight));
* }
*/
public void Uninstall()
{
Clear();
if (textArea != null)
{
textArea.Caret.PositionChanged -= textArea_Caret_PositionChanged;
textArea.LeftMargins.Remove(margin);
textArea.TextView.ElementGenerators.Remove(generator);
margin = null;
generator = null;
textArea = null;
}
}
public FoldingManagerInstallation(TextArea textArea) : base(textArea.TextView, textArea.Document)
{
this.textArea = textArea;
margin = new FoldingMargin()
{
FoldingManager = this
};
generator = new FoldingElementGenerator()
{
FoldingManager = this
};
textArea.LeftMargins.Add(margin);
textArea.TextView.ElementGenerators.Add(generator);
textArea.Caret.PositionChanged += textArea_Caret_PositionChanged;
}